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Laser welding method

A technology of laser welding and laser beam, which is applied in the direction of laser welding equipment, welding equipment, metal processing equipment, etc., and can solve problems such as non-welding, affecting welding quality and stability, and spattering

Active Publication Date: 2013-09-04
HANS LASER TECH IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the influence of the galvanized layer, welding defects such as spatter and unwelded welding are prone to occur during laser lap spot welding of galvanized sheets, which seriously affects the welding quality and stability.

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Embodiment Construction

[0018] The invention provides a kind of laser welding between two galvanized sheets, but because the boiling point of zinc element (907°C) is too low relative to the melting point of iron element (1538°C), and the laser welding process is extremely fast (millisecond level), resulting in zinc The evaporation of elements and the melting of iron elements occur almost simultaneously. In a very short period of time, the galvanized layer between the two galvanized sheets evaporates rapidly to form zinc vapor and expands rapidly, welding the upper plate to the liquid metal in the molten pool. The molten pool is sprayed out to form splashes, and the effective bonding area of ​​the solder joint is reduced due to the loss of metal filling, resulting in the inability to form a firm and stable solder joint.

[0019] The reason why laser spot welding is unstable is that the galvanized layer between the two galvanized sheets cannot be discharged in time after evaporation during the welding p...

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Abstract

The technical scheme adopted by the invention is to provide a laser welding method, which comprises the following steps that: the opposite surfaces of two opposite steel plates are galvanized respectively; a certain clearance is preserved between the two galvanized plates; and a laser beam performs laser welding on the two galvanized plates. The laser welding method preserves the certain clearance between the galvanized plates to be welded so that zinc fume in the welding process can be discharged from the preserved clearance; and thus, the problems of the reduction of an effective bonding area of welding points, the reduction of intensity and the instabilities of overall welding process and intensity caused by easily generated splash when welding the technological parameters, namely stainless steel and a zinc alloy, are solved.

Description

【Technical field】 [0001] The invention relates to a laser welding method, in particular to welding of galvanized sheets. 【Background technique】 [0002] For the material welding of galvanized sheets, the traditional processing method is generally resistance welding, and compared with resistance welding, laser beam welding has the advantages of single-sided processing, increased structural strength, no electrode wear, stable welding quality, non-contact processing, flexibility, The characteristics of fast welding speed and small welding deformation have attracted more and more attention. However, due to the influence of the galvanized layer, welding defects such as spatter and lack of welding are prone to occur during laser lap spot welding of galvanized sheets, which seriously affects the welding quality and stability. [0003] From the analysis of the welding process, the instability of laser lap spot welding of galvanized sheets is caused by the following three reasons: ①...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/20B23K26/22
Inventor 高云峰肖华朱宝华彭荣森
Owner HANS LASER TECH IND GRP CO LTD